"Hahnia" obliqua is a poorly known species of meat-eating stem-mammals (cynodonts) that lived during the Upper Triassic in Europe.

The genus "Hahnia" ("for Hahn") was named by Pascal Godefroit and Bernard Battail in 1997 based on a single species.

Fossil remains of the species "Hahnia" obliqua have been found in the Norian (late) - Rhaetian (early) (Upper Triassic)-age strata of Saint-Nicolas-de-Port in France.

The authors discuss similarities with teeth of galesaurids (something like forerunners of the eucynodonts), Cynognathus, chiniquodontids, tritheledontids, dromatheriids and various other small cynodonts of the European Upper Triassic; They are all carnivores of one size or another.

However, as there are also clear differences to the tiny teeth of "Hahnia", the authors plump for Cynodontia incertae sedis (aka of some kind or other).